$\frac{12}{4x}\left(\frac{3}{x}\right)$

$7\sqrt{3+2}$

$\int\frac{\left(\sqrt{u}+3\right)^4}{\sqrt{u}}dx$

$\cos\left(2.5868\right)$

$\left(x-2\right)+\left(5x+\sqrt{x}\right)$

$\frac{d^2}{dx^2}\left(x\cdot\cos\left(x\right)\right)\tan\left(4x\right)$

$3r+10r$